<audio>
and <video>
tags without Javascript.video/ogg;%20codecs=%22theora,%20vorbis%22
<video preload="auto" controls="controls">
<source src="https://upload.wikimedia.org/wikipedia/commons/b/b3/Big_Buck_Bunny_Trailer_400p.ogv" type='video/ogg;%20codecs=%22theora,%20vorbis%22'>
</video>
HTMLMediaElement.canPlayType('video/ogg;%20codecs=%22theora,%20vorbis%22')
→ MediaSource.isTypeSupported('video/ogg;%20codecs=%22theora,%20vorbis%22')
→